
#include <bits/stdc++.h>
#include <cmath>
using namespace std;
/*
题目描述：

*/

int main()
{   
    int m, t, s;
    cin >> m >> t >> s;
    int a, res;
    if(t == 0)
    {
        cout << 0;
        return 0;
    }
    // res = m-ceil((double)s/t);
    
    cout << res;
    return 0;
}